Summary Of Significant Accounting Policies (Narrative) (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) a segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)		Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Restricted cash, Current	$ 17,000		$ 1,300,000	$ 17,000
Number of segments | segment			2
Derivative position			$ 186,000
Goodwill impairment			0	0	$ 0
Advertising expense			2,400,000	2,300,000	2,300,000
Gains/(losses) on the settlement of litigation				1,800,000	415,000
Deferred tax asset	24,746,000		26,235,000	24,746,000
Occupancy cost expense			(9,904,000)	(9,437,000)	(9,044,000)	[1]
Prior period immaterial error amount		$ 440,000
Non Income Producing Properties [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment losses			$ 0	$ 0	0
Mt. Gravatt [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage			33.30%
Rialto Cinemas [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage			50.00%
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Lease liabilities							$ 250,000,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]							us-gaap:Liabilities
Right-of-use assets							$ 250,000,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]							us-gaap:Assets
Australian Country Cinemas, Pty Ltd [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage by parent			75.00%
Sutton Hill Properties, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage by parent			75.00%
Shadow View Land And Farming, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage by parent			50.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage			20.00%
Lease term of contract			5 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage			50.00%
Operating lease renewal term			20 years
Lease term of contract			15 years
Shadow View Land And Farming, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Area of property | a			202
Adjustments [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred tax asset					$ 611,000
Occupancy cost expense	$ 544,000

[1] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).